Maintaining higher mileage trucks

I'm 70 also and have a 11 year old, 2007 Toyota Tundra with 61,000 miles. Until recently it's been totally reliable. I thought about trading it in, but at my age I can't quite stomach truck payment. I've got a great independent mechanic that does great work with very reasonable hourly rates. My rational is that a lot of the work that needed doing equaled only one or two monthly truck payments.:) For instance, I just had a front wheel bearing replaced and new rear shocks installed. Bill was $460 total. That I can handle1

I recently did go to Toyota to have my catalytic converters replaced. They were totally rotted out. Cost was ridiculous!!